Apple WatchOS 9's New Features Include Sleep Tracking, Medication Reminders - CNET

WatchOS 9 can detect REM, core and deep sleep, as well as offer heart health support and prompt you to take meds.

Apple Watch - Wikipedia

Apple Watch Series 6: What to expect - MacDailyNews

WatchOS 9: All the New Apple Watch Features Coming Soon - CNET

watchOS 9 preview: A hearty upgrade for workout and sleep tracking

Apple WatchOS 9's New Features Include Sleep Tracking, Medication Reminders - CNET

Why watchOS 9's Sleep Tracking Will Make Other Apps Unnecessary

watchOS 9 delivers new ways to stay connected, active, and healthy - Apple

watchOS 9 delivers new ways to stay connected, active, and healthy - Apple

Don't Wait! I Just Scored the Apple Watch Series 8 for $100 Off in an Early Black Friday Deal., by Jackson Luca

watchOS 9 delivers new ways to stay connected, active, and healthy - Apple